
import java.io.*; 

class Jv_4_5 { 

	public static void main(String[] args)
	throws java.io.IOException { 
		int jumsu; 
		char hakjum; 
		String iput; 
		System.out.println("***** result *****"); 
		System.out.print("Input jumsu: "); 
		InputStreamReader kkk = new InputStreamReader(System.in); 
		BufferedReader bbb = new BufferedReader(kkk); 
		iput = bbb.readLine(); 
		jumsu = Integer.parseInt(iput); 
		switch(jumsu/10)
		{
		case 10: hakjum = 'A'; break;
		case 9: hakjum = 'B'; break; 
		case 8: hakjum = 'C'; break; 
		case 7: hakjum = 'D'; break;
		case 6: hakjum = 'E'; break; 
		default: hakjum = 'F'; break; 
		}
		System.out.println("Hakjum: " + hakjum); 
	} 
} 
